How many times can you subtract 21 from 78?

"How many times can you subtract 21 from 78?" is a tricky question. We think that there are three different answers to this question.

Answer 1: Once
It is once, because after you subtract 21 from 78 once, you are left with 57. Thus, you cannot subtract 21 again from 78.

Answer 2: 3.71 times
3.71 times, because 78 divided by 21 is 3.71. After you subtract 21, 3.71 times from 78, then there is nothing left to subtract from.

Answer 3: Infinite
There is nothing that says you can't keep subtracting 21 from 78 indefinitely. Just because you will end up with negative numbers doesn't mean you have to stop subtracting!

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How many times can you subtract 21 from 79?
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